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Cleaning the evaporator


JJNOLA

Active Member
Joined
Jul 10, 2017
Messages
37
Vehicle Year
1994
Transmission
Manual
1994 b2300. What's the easiest and simplest way to clean the evaporator? I've seen a few videos of people taking out the blower motor. Is it possible to just pop open the top of the housing enough to grab the leaves and spray some cleaner in there or is removing the blower motor the best way? Thanks!

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No way it's easy! If you're going to do it you may as well completely do it like we did when we replaced the evaporator in my truck which is a 94 supercab. There are stud bolts on the firewall and the heater compartment
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Do you think it is full of leaves, or just nasty and dirty and causing smells?

If it is the later there are a number of very effective foaming cleaners that can be sprayed up into the drain.

If it is the former you pretty much need to take it out of the vehicle.
 
Don't have a 94, but for an 85, the easiest way was to remove the blower and reach in for manual extraction of leaves, etc. I also used a shop vac to suck out anything else that I could not manually get. I think I then used a garden hose with nozzle to spray down the evaporator and check that the condensate drain was functioning and not blocked.
I re-used the goo that seals the blower motor to the housing. If you cannot, RTV will work, or you can use latex caulk, or the 'rope' stuff from an auto parts store. It does not take a lot to seal.
Check the blower motor bearings for rough or stiff turning while you have it out. It's old enough to go for a drink at a bar, so some attention now could save from future problems. The motors are not readily openable to add lube to the bushings, but you can dribble some oil down the wheel end/output shaft to get onto the bushing. I have drilled an access hole on the other end to drip in some oil and then plugged with a dab of caulk.
While totally under the hood, you can remove the three panels, well two and a wiper motor, and gain access to the intake plenum. Most times it will have enough decomposing leaves to start a garden. There are 'flap' drains at either end that can get blocked with decaying matter, and cause the rainwater level to rise above the rim of the intake leading to the blower chamber. If the flaps are plugged.
tom
 
Nice pictures and great replies!! I've swapped my entire r12 system for r134a about a year and a half ago. Everything is new except the evaporator. Blower motor is new too. When I replaced the blower, I only cleaned hand deep, which wasn't too bad. I was just an amateur when I replaced my ac, now I'm an amateur that knows a little more. Ac blows fine, no funny smells, I just like to keep up with my truck in anyway possible. She's been good to me so I'll be good to her. If I have to crack open the system, I'll just wait until something fails. Until then, I'll remove the blower and see what else I can clean out that way. Thanks again for the replies!

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Be sure you check the resistor for the debris because mine actually had weeds & leaves in it and I understand the resistor gets quite hot.
 

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